Joso Bridge--no schedule. Be in the right place at the right time.

Wallula Shuttle ran to Hooper from the River on Sunday a couple of weeks ago--which means a possible 2nd round trip of the week. The Co-op could have held back until prices got better of they were clearing the elevators out. No way to tell.

Great northwest can leave Lewiston any time from late morning to evening. Return trip is always overnight.

BG&CM--no clue.

You also have the Blue Mountain RR from Wallula to Walla Walla (too many W's, A's, and L's there). Not sure what their schedule is. The cannery at Dayton usually gets a turn a week. I have worked on that line on a bridge re-hab a couple of years ago, but never managed to catch anything running.

The UP and BNSF have some locals working some interesting rural/industrial areas south of Kennewick on a daily (at least weekday) basis. (UP in the AM, I think, and the BNSF in the afternoon. The BNSF runs the Low Line job from Pasco to Wallula and then onto the UP to Ayer during the afternoons. The job can get some funky power at times. Usually leaves Pasco right after noon.

"South Central" might include the Columbia Basin RR (Central WA RR) branch package out of Gibbon to Granger and Sunnyside. I'm pretty sure that this is a daylight operation.